Automatic gas-cut-off and safety device.



M. F. NICHOLS.

AUTOMATIC eAs GUT-OPT AND SAFETY DEVICE.

'APILIOATION FILED JAN.14, 1909.

934,339, Patented Sept. 14, 1909.

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UNTED .STATES PATENT, QFFICE.

' MARCUS FREI'JRICK NICHOLS, or oswAYo'PENNsYLvAN/IA.

`.iucloivIA'-rIC`GAS.-CUcr-orfr AND SAFETY DEVICE.

To all whom it may concern:

Be it known that' I, MARCUS FREDRICK NICHOLS, a citizen f the UnitedStates, residing at Oswayo, in the county ofgPotter and State of Pennsylvania, have invented a new and useful Automatic Gas-Cut-Of and Safety Device, ofwhich the ,following is a specification.

- This invention .relates to automatic cut off vvalves of that general class shown and described in YUnited Statesl Letters Patent issued to me on the 8th day of December 1908, under Serial'No. 906152..

The object of the invention is generally to improve and simplify the construction of the cut olf and to provide means for automatically closing the controlling valve of the supply pipe in case'the fluid pressure falls below a predetermined point.

Further objects and advantages will ap-V pear in the following description, itA being understood that various changes in form, proportions and minor details of construction may be resortedto within the scope of the appended Claims.

In the accompanying drawings forming a part of this specification:-Figure 1 is a longitudinal sectional view of an automatic cut olf constructed in accordance with my invention, a portion of the device being shown in elevation. Fig. 2 isa longitudinal sectionalview Vof the turning plug or valve.

of the main supply pipe.

Similar numerals of reference indicate corresponding parts in all of the figures of the drawings.

pansiblevalvev 9. One wall-of the casing 5 is provided with a lateral extension 10 which is connected through the. medium of a coupling 11 with a main supply pipe 12, there being a by-pass 13 arranged beneath, theI extension 10fand forming a source of com-v n'iunication between the main supply pipe V12 and the interior of the chamber 8, as

shown. n The side walls f theextension 10 at the juncture of the latter with the'casing 5 are inclined laterally to produce 'a sub` stantially tri-angular shaped chamber 14, the

interior walls of the chamberll at the apex land thence lthrough the pipe 7 and chamber 8 to the service pipe 21, the entrance of the gas to the service pipe' being controlled by a liap valve 22 similar in construction tothe flap valve' shownin my former patent above referred to. i

Securedv to or formed integral with the Specification of Letters Patent. ,i Patented Sepjtizjz 1,909,

Application filed January 14, 1909. Serial No. 472,207.r

of the latter'being curved or ground to form i valve 16 is a laterally extending arm 23,'

the free end of, which is A reduced to form 'a' finger 24 whichv enters an'eye or loop 25 depending fromthe bottom of the expansible valve 9, this valve 9 beingclosed on three sides thereof by the vexpansible walls 26 and f open at its bottom, as indicated at 27, to permit theentrance of gas under pressure to the interior of said valve. An auxiliary valve 28 is also preferably arranged in theby-pass 13 for kcontrolling the flow of 'gas `through said by-pa`ss to the chamber 8.

Thus it' will be seen that with the lseveral parts in the full line position shown in Fig.

"1 of the drawings, should the vsupply of gas be accidentally cut roff or the pressure re-` duced or partially reduced, the valve 9 will drop by gravity and in doing so actuate the turning plug or valve 10-to automatically cut oft' the iiow. of gas through the supply pipe and casings 5 and 6 to the service pipe.- 'In order to re-set the valve, the turning plug 28 is moved to .open-position, thus allowing thegas from the supply pipe, to flow through the by-pass. into the chamber 8 where it enters the valvey 9 through the' open ,end thereofan'd elevates the same, the pet Lcock 29 being previously opened to ,exhaust the' air in the chamberv 'above the valve 9 so 'as to permit the latter to be'movedv to open In some cases it has been found desirable. to provide means for manually operating I the valve orv turning plufr 16 and in orderto eii'ect this result one oi the trunnions 19 is formed lwith a squared socket adapted t'o receive the' correspondingly squared yterminal of an operating handle or key 3l,

which latter passes through an opening 32 in the adjacent bearing pin 17, as best shown in Fig. 2 of the drawings. v

Attention is here called to thevfact that the inclined walls of the chamber 14 by engagement with the arm 28 serves to limit A the turning movement of the plug or -valve 15 16, while the contracted portion 33 of the extension l0 prevents the admission of gas into the chamber 14 when the valve is in closed position.

lVhile it is preferred to use the attachn ment in the supply pipe it is obvious that the same may be arranged within the inclined pipe 7 or operatively connected with the valve 22 without departing from the spirit of the invention.

Having thus'described thel invention what y is claimed vis l. In an automatic cut 0E, a casing having fluid inlet and discharge pipes,`a bypass forming a source of communication between one of said pipes and the interior of the casing, a hollow valve mounted for vertical movement within the casing above one end of the by-pass, an oscillating valve for controlling the low of gas through the supply pipe,`and a connection between said valves for automatically closing the supply pipe valve upon a reduction in the Huid pressure.

2. In an automatic cut ofl", a casing having fluid inlet and discharge pipes, a bypass forming a' source of communication between one of said pipes and the interior o of the casing, means r controlling the flow of fluid through the by-pass, a. hollow valve slidably mounted within the casing above one end of the by-pass, an auxiliary valve for controlling the passage of gas through the supply ipe to the casing, and an arm projecting rom the auxiliary 4valve and actuated by engagement with the sliding valve to close said auxiliary valve upon a reduction in the fluid pressure.

' 3. In an automatic cut off, a casing having I fluid inflet and discharge pipes, a by-pass 55 forming a source of communication between one of said pipes and the interior of the cas-A ing, means for controlling the passage of' fluid'through thefby-pass to the interior of the lcasing, an expansible valveslidably mounted within the casing, an auxiliary valve arranged in the supply pipe, said auxiliary valve-being actuated by engagement with'the expansible valve fgr automatically closing the auxiliary valve upon a reduction 'in the Huid pressure.

4'. In an automatic cut oli", a lcasing-having' fluid inlet and v discharge pipes, a by-pass forming'a source of communlcation between' .'I`

one of said pipes and the interior of the casing, means for controlling the passage of fluid through the by-pass, a valve sli ably mounted withinthe casing and provided with a4 depending eye, an auxiliary valveconnected in the supply pipe, and an arm extended laterally from the auxiliary Valve and engagingthe eye of the sliding valve for moving the auxiliary valve to closed po- "sition upon a reduction in the Huid pressure.

5. In an automatic cut oi, a casing having iuid inlet and discharge pipes, a by-pass forming a source of communication between one of said pipes and the interior .of the casing, means for controlling the passage O f fluid through the by-pass, an expansible valve operating'within the casing and provided with a depending eye, an auxiliary valve arranged in the supply pipe and provided with an arm having a reduced extension operating in the eye of the expansion valve. j

6. In an automatic cut off, a casing having fluid inlet and discharge pipes and having one wall thereof expanded laterally atv its juncture with the supply pipe to produce an interior chamber having a valve-seat formed therein, a by-pass forming a source-of communication between the supply pipe andthe interior of the casing, means for controlling the passage of fluid through the by-pass, a

vertically movable valve operating within the casing, an oscillating auxiliary valve engaging the valve-Seat, and a-n arm extending laterally from the auxiliary valve and actuated by engagement with the 'slidingavalve to close said auxiliary valve upon a reductionin the fluid pressure. y

7. I n an4 automatic cut off, a casing having fluid inlet and discharge pipes, a by-pass forming a source of communication between the supply pipe and the interior of the casing, a main valve operating within the casing, an auxiliary valve arrangedwithin the supply pipe and operatively connected with the main valve, pins threaded inthe supply pipe and having cone shaped bearings formed therein, and trunnions formed on the opposite ends of the auxiliary valve for enassaoe an auxiliar valve havinF o )ob 9 t:

sitely disposed trunnions engaging the bearings in the pins and provided with an arm gagenient with the-cone shaped bearings of 'i fluid inlet and discharge pipes, a by-pass forming a source of communication between the supply pipe and the interior of the cas- `1ng, a hollow main valve arranged within 10A the' casing and having an opening therein forming. a source of communication between the. interior of the valve and sald by-pass, an

casing', and an arm projecting laterally from 15 the auxiliary valve and operativelyconnected with the main valve.

In testimony that I claim the foregoing as my own, I have hereto alixed my signature in the presence of two witnesses.

MARCUS FREDRICK NICHOLS.

Witnesses: 1 1

' H. R. EASTON, C; A. EWELL. 

